scholarly journals Design of eddy current dampers for vibration suppression in robotic milling

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401881407 ◽  
Author(s):  
Fan Chen ◽  
Huan Zhao
Keyword(s):  
Eddy Current ◽  
Vibration Suppression ◽  
Milling Process ◽  
Magnetic Flux Density ◽  
Depth Of Cut ◽  
Chatter Suppression ◽  
Robotic Milling ◽  
Eddy Current Damper ◽  
Damper Design ◽  
Milling Robot

The milling robot normally has a low stiffness which may easily cause chatter during machining. This article presents a novel eddy current damper design for chatter suppression in the robotic milling process. The designed eddy current dampers are installed on the milling spindle to damp the tool tip vibrations. The structural design and the working principle of the eddy current dampers are explained. The magnetic flux density distribution and the magnetic force generation of the designed eddy current damper are analyzed with the finite element method. The tool tip dynamics without and with eddy current dampers are modeled, and the damping performance of the proposed eddy current dampers in the robotic milling process is verified through both simulations and experiments. The results show that the peaks of the tool tip frequency response function caused by the milling tool modes are damped significantly, and the stable depth of cut is improved greatly with eddy current dampers.

Precision Motion Control with Active Eddy Current Damper

2010 ◽  
Vol 447-448 ◽  
pp. 493-497
Author(s):  
Chek Sing Teo ◽  
Chea Jack Ong ◽  
C.J. Ho ◽  
S. Huang ◽  
K.K. Tan
Keyword(s):  
Eddy Current ◽  
Eddy Currents ◽  
Vibration Suppression ◽  
Linear Motor ◽  
Precision Motion Control ◽  
Damping Effect ◽  
Eddy Current Damper ◽  
Damper Design ◽  
Precision Motion ◽  
Conducting Sheet

This paper describes the design and proof of concept for an active eddy current damper which is integrated into a single-axis linear motor. Although developments on active eddy current damper are well documented, none has been implemented in a linear motor. The advantage of such a system is two-fold. Firstly, the relative motion between the magnets and the conducting sheet produces eddy currents resulting in an electromagnetic force opposing the direction of motion; which can be utilized to suppress vibrations. Secondly, it is possible to enhance the damping effect of the system; Due to environmental noise, it is normally not possible to increase the D coefficient in a PID controller as much as desirable. The damper is thus able to supplement this damping effect to improve settling time. Here, we will present the damper design as well as the preliminary experiment results for both vibration suppression and motion damping.

Design Procedure of an Eddy Current Damper Type Reaction Force Compensation (RFC) Mechanism for a Linear Motor Motion Stage

2015 ◽  
Author(s):  
HyeongJoon Ahn
Keyword(s):  
Eddy Current ◽  
Reaction Force ◽  
Design Procedure ◽  
Linear Motor ◽  
Lumped Parameter Model ◽  
Magnetic Flux Density ◽  
Eddy Current Damper ◽  
Linear Motor Motion Stage ◽  
Motion Stage ◽  
Reaction Force Compensation

Base vibration of a linear motor motion stage has been reduced with passive RFC mechanism based on movable magnet track and springs. This paper presents design procedure of an eddy-current damper (ECD) type RFC mechanism for a linear motor motion stage. The RFC mechanism with a movable magnet track and an ECD can overcome disadvantages of the spring based RFC mechanism such as resonance and difficulty of assembly due to spring. A lumped parameter model for the ECD type RFC mechanism is derived considering sinusoidal magnetic flux density and effective width of the ECD according to magnet track motion. Then, a design procedure for ECD type RFC mechanism is proposed to meet system requirements such as transmission ratio of reaction force and maximum magnet track motion. Design example illustrates the effectiveness of the proposed design procedure for ECD type RFC mechanism.

A passive eddy current damper for vibration suppression of a force sensor

2013 ◽  
Vol 46 (7) ◽  
pp. 075001 ◽  
Author(s):  
Weihai Chen ◽  
Jun Jiang ◽  
Jingmeng Liu ◽  
Shaoping Bai ◽  
Wenjie Chen
Keyword(s):  
Eddy Current ◽  
Vibration Suppression ◽  
Force Sensor ◽  
Eddy Current Damper

Eddy Current-Based Vibration Suppression for Finish Machining of Assembly Interfaces of Large Aircraft Vertical Tail

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Wei Fan ◽  
Lianyu Zheng ◽  
Wei Ji ◽  
Xiong Zhao ◽  
Lihui Wang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Vibration Suppression ◽  
Vibration Velocity ◽  
Wall Structure ◽  
Thin Wall ◽  
Finish Machining ◽  
Element Simulation ◽  
Eddy Current Damper ◽  
The Mathematical Model ◽  
The Relationship

Assembly interface of aircraft vertical tail is a large thin-wall structure and made from titanium alloys, which causes easily machining vibration, deformation and undercutting in finish machining due to its low stiffness, low thermal conductivity, and high chemical activity. To address these problems, a novel eddy current damper for assembly interfaces machining (ECD-AIM) is proposed to suppress multimodal vibration in the machining of the assembly interfaces. Within the context, the mathematical model of damping performance of the damper is established based on the principle of electromagnetic induction, based on which a novel design of the damper is proposed, and optimized by considering the relationship between damping performance and the key components of the damper. Then, the dynamics model of the suppression system of the assembly interface machining is established, where the relationship between vibration velocity and damping performance of the damper is obtained by using numerical analysis and finite element simulation. Finally, the damping performance of the damper is validated in terms of the three configurations (no applied ECD-AIM, a single ECD-AIM, and dual ECD-AIMs) via a set of dynamic tests (impact tests and harmonic tests) and cutting tests. The test results demonstrate that the configuration of dual ECD-AIMs can guarantee stability and reliability of assembly interface machining. The proposed damper can provide a feasible solution for vibration suppression in a limited workspace.

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